public static (EventPropagationPath removed, EventPropagationPath added) CalculateDeviation(
EventPropagationPath oldPath,
EventPropagationPath newPath)
{
if (oldPath.IsEmpty)
{
return(Empty, newPath);
}
if (newPath.IsEmpty)
{
return(oldPath, Empty);
}
var shortestPathLength = Math.Min(oldPath.path.Count, newPath.path.Count);
var firstDeviationIndex = 0;
while (firstDeviationIndex < shortestPathLength)
{
if (oldPath.path[firstDeviationIndex] != newPath.path[firstDeviationIndex])
{
break;
}
firstDeviationIndex++;
}
return(oldPath.getPathFromIndex(firstDeviationIndex), newPath.getPathFromIndex(firstDeviationIndex));
}
internal void Update()
{
var mousePosition = root.TransformViewportPosToFramePos((Vector2d)inputManager.MousePosition);
var modifierKeys = ModifierKeys.FromInputManager(inputManager);
var path = EventRouter.FindPropagationPath(
root, control =>
{
if (!control.IsVisible || !control.Frame.ContainsPoint(mousePosition))
{
return(EventRouter.PropagationTestOutcome.Miss);
}
return(control.IsClickThrough
? EventRouter.PropagationTestOutcome.PassThrough
: EventRouter.PropagationTestOutcome.Hit);
});
var(removedFromPath, addedToPath) = previousPropagationPath != null
? EventPropagationPath.CalculateDeviation(previousPropagationPath, path)
: (EventPropagationPath.Empty, path);
var eventArgs = new MouseEventArgs(mousePosition, modifierKeys);
// Mouse exit
removedFromPath.PropagateEvent(
eventArgs,
(c, e) => c.PreviewMouseExited(e),
(c, e) => c.MouseExited(e));
// Mouse enter
addedToPath.PropagateEvent(
eventArgs,
(c, e) => c.PreviewMouseEntered(e),
(c, e) => c.MouseEntered(e));
// Mouse move
path.PropagateEvent(
eventArgs,
(c, e) => c.PreviewMouseMoved(e),
(c, e) => c.MouseMoved(e));
// Mouse clicks
foreach (var btn in mouseButtons)
{
var action = inputManager.Actions.Mouse.FromButton(btn);
if (action.Hit)
{
path.PropagateEvent(
new MouseButtonEventArgs(mousePosition, modifierKeys, btn),
(c, e) => c.PreviewMouseButtonHit(e),
(c, e) => c.MouseButtonHit(e));
}
if (action.Released)
{
path.PropagateEvent(
new MouseButtonEventArgs(mousePosition, modifierKeys, btn),
(c, e) => c.PreviewMouseButtonReleased(e),
(c, e) => c.MouseButtonReleased(e));
}
}
// Mouse scroll
// ReSharper disable once CompareOfFloatsByEqualityOperator
if (inputManager.DeltaScrollF != 0)
{
path.PropagateEvent(
new MouseScrollEventArgs(
mousePosition, modifierKeys, inputManager.DeltaScroll, inputManager.DeltaScrollF),
(c, e) => c.PreviewMouseScrolled(e),
(c, e) => c.MouseScrolled(e));
}
previousPropagationPath = path;
}
